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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Are DTCs P1635 or P1639 also set? If yes, go to DTC P1635: 5-VOLT REFERENCE 1 CIRCUIT  or DTC P1639: 5-VOLT REFERENCE 2 CIRCUIT  . If no, go to next step.
  3. Observe the Freeze Frame/Failure Records for this DTC. Turn ignition off. If the engine cranks but does not start, go to step  5. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to next step. If no, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L & 3.0L VUE article.
  4. Inspect vacuum hoses for splits, kinks, and proper connections. Inspect thoroughly for any type of leak or restriction. Inspect for air leaks at throttle body mounting area and intake manifold sealing surfaces. Did you find and correct the condition? If yes, go to step  8. If no, go to next step.
  5. Observe the MAP sensor voltage parameter with a scan tool. Is the MAP sensor voltage 0.8-4.0 volts? If yes, go to next step. If no, go to DTC P0105: MAP SENSOR CIRCUIT RANGE/PERFORMANCE .
  6. Operate engine at idle. Observe the MAP sensor kPa parameter with a scan tool. Increase the engine speed slowly, and then back to idle. Does the MAP sensor kPa change smoothly and gradually as the engine speed is increased and returned to idle? If yes, go to next step. If no, go to DTC P0105: MAP SENSOR CIRCUIT RANGE/PERFORMANCE .
    7. CAUTION: Turn ignition off before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.
  7. Inspect the throttle body for the following conditions while modulating the throttle using the scan tool: Loose or damaged throttle blade, broken throttle shaft, or drive mechanism damage. If any of these conditions exist, replace the throttle body assembly. Did you find and correct the condition? If yes, go to next step. If no, problem is intermittent.
  8. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Operate vehicle within the conditions for running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate vehicle within the conditions observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  9. With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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